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The Cover: This issue of the Technical Digest features two articles in memory of the life and accomplishments of Alexander Kossiakoff and documents his 60-year career as a full-time APL staff member. In addition, the issue includes a collection of APL research and development articles on sensor fusion architectures, military satellite communication, unmanned aerial vehicle swarming concepts, neutron energy spectrometer space applications, remote patient status monitoring, and interactive training simulators.